Utilization of Organic Fertilizer in Ghana: Implications for Crop Performance and Commercialization

Table 8

Estimates of the endogenous treatment effect model of the impact of organic fertilizer on gross margin.

Variables	Gross margin		OF
	Coef.	Std. err.	Coef.	Std. err.
Farm size	227.619	88.030
Worth	0.008	0.045	0.000	0.000
Chemical fertilizer	−2.673	0.779
Organic fertilizer	−0.697	0.675
Age			0.009	0.008
Extension serv.			0.003	0.052
OF FBO			0.552	0.217
OF affordability			0.342	0.232
1.OF (ATET)	431.134	168.533
Constant	−248.777	411.673	−0.984	0.411
/athrho	−1.226	0.210
/lnsigma	7.582	0.093
rho	−0.842	0.061
sigma	1963.300	183.442
lambda	−1652.150	250.469
Log likelihood	−932.162
Wald test χ^2 (19)	51.77
LR test of independent equations χ^2 (1) 12.5

Significant at 1% level of significance; significant at 5% significance level; significant at 10% significance level.